Algebra
posted by y912f
53. Determine if y=x^2 is a function.
i think the answer is yes, but can someone explain to me why it's yes, and how you find out if it's a function or not.
I know that for every value of x there should be one value of y, but how do you figure that out in a problem like this?

bobpursley
for any x, you get a specific y. It is a function. Now for any x, you get more than one y, it is not a function.

y912f
So, this one is a function..? because for x you get only one y

bobpursley
Yes, if any x maps to one specific y, it is a function.
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